<template>
    <div class="add-role">
        <header class="add-header">
            <div class="left">
                <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>
                <span>|</span>
                <span>{{ id ? '编辑角色' : '添加角色' }}</span>
            </div>
            <div class="right">
                黑马程序员
            </div>
        </header>
        <main class="add-main">
            <div class="step-container">
                <el-steps direction="vertical" :active="activeStep">
                    <el-step title="角色信息" />
                    <el-step title="权限信息" />
                    <el-step title="检查并完成" />
                </el-steps>
            </div>
            <div class="form-container" v-show="activeStep === 1">
                <div class="title">角色信息</div>
                <div class="form">
                    <el-form class="form-box" :model="roleForm" :rules="roleRules" ref="roleForm">
                        <el-form-item label="角色名称" prop="roleName">
                            <el-input v-model="roleForm.roleName" />
                        </el-form-item>
                        <el-form-item label="角色描述" prop="remark">
                            <el-input v-model="roleForm.remark" />
                        </el-form-item>
                    </el-form>
                </div>
            </div>
            <div class="form-container" v-show="activeStep === 2">
                <div class="tree-wrapper">
                    <div class="tree-item" v-for="item in treeList" :key="item.id">
                        <div class="tree-title">{{ item.title }}</div>
                        <!-- check-strictly:接触父子级管理 -->
                        <el-tree ref="tree" show-checkbox check-strictly default-expand-all node-key="id"
                            :data="item.children" :props="defaultProps" />
                    </div>
                </div>
            </div>
            <div class="form-container" v-show="activeStep === 3">
                <div class="title">检查并完成</div>
                <div class="form">
                    <div class="form">
                        <div class="info">
                            <div class="form-item">角色名称：{{ roleForm.roleName }}</div>
                            <div class="form-item">角色描述：{{ roleForm.remark }}</div>
                            <div class="form-item">角色权限：</div>
                            <div class="tree-wrapper">
                                <div v-for="item in treeList" :key="item.id" class="tree-item">
                                    <div class="tree-title">{{ item.title }}</div>
                                    <el-tree ref="diabledTree" :data="item.children" show-checkbox check-strictly
                                        default-expand-all node-key="id"
                                        :props="{ label: 'title', disabled: () => true }" />
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </main>
        <footer class="add-footer">
            <div class="btn-container">
                <el-button @click="prev" v-show="activeStep !== 1">上一步</el-button>
                <el-button type="primary" @click="next" v-show="activeStep !== 3">下一步</el-button>
                <el-button type="primary" v-show="activeStep === 3" @click="confirmAdd">确认添加</el-button>
            </div>
        </footer>
    </div>
</template>

<script>
import { getTreeListAPI, createRoleUserAPI, getRoleDetailAPI, updateRoleAPI } from '@/api/system'
export default {
    data() {
        return {
            activeStep: 1,
            roleForm: {
                roleName: '',
                remark: '',
                perms: []
            },
            roleRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' }
                ],
                remark: [
                    { required: true, message: '请输入描述名称', trigger: 'blur' }
                ]
            },
            treeList: [],
            defaultProps: {
                label: 'title'
            },
        }
    },
    created() {
        this.getTreeList();
        if (this.id) {
            this.getRoleDetail();
        }
    },
    computed: {
        id() {
            return this.$route.query.id
        }
    },
    methods: {
        //回显数据
        async getRoleDetail() {
            await getRoleDetailAPI(this.id).then(res => {
                this.roleForm = res.data;
                const treeComponents = this.$refs.tree;
                treeComponents.forEach((item, index) => {
                    item.setCheckedKeys(this.roleForm.perms[index]);
                })
            })
        },
        // 确认添加或者编辑
        async confirmAdd() {
            if (this.id) {
                delete this.roleForm.userTotal;
                await updateRoleAPI(this.roleForm);
                this.$message.success('修改成功');
            } else {
                await createRoleUserAPI(this.roleForm);
                this.$message.success('添加成功');
            }
            this.$router.back()
        },
        // 上一步
        prev() {
            if (this.activeStep === 1) return
            this.activeStep--;
        },
        // 下一步
        next() {
            if (this.activeStep === 3) return
            // 第一步的统一校验
            if (this.activeStep === 1) {
                this.$refs.roleForm.validate(flag => {
                    if (!flag) return
                    this.activeStep++;
                })
            } else if (this.activeStep === 2) {
                // 进入下一步之前应该加一些判断[用户是否勾选了权限信息]
                const treeComponents = this.$refs.tree;
                // 每次点击下一步之前，先清空原来的perms数据。
                this.roleForm.perms = [];
                treeComponents.forEach(tree => {
                    this.roleForm.perms.push(tree.getCheckedKeys())
                })
                // flat() 可以对多维数组进行降维，参数传几就降几维，参数穿Infinity表示无线循环,返回的是一个新的数组
                if (this.roleForm.perms.flat().length <= 0) {
                    this.$message.warning('还没有勾选权限信息');
                    return
                }
                const disabledTreeList = this.$refs.diabledTree;
                disabledTreeList.forEach((tree, index) => {
                    tree.setCheckedKeys(this.roleForm.perms[index]);
                })
                this.activeStep++;
            }
        },
        // 获取所有的权限列表
        async getTreeList() {
            await getTreeListAPI().then(res => {
                this.treeList = res.data;
            })
        }
    }
}
</script>

<style scoped lang="scss">
.add-role {
    background-color: #f4f6f8;
    height: 100vh;

    .add-header {
        display: flex;
        justify-content: space-between;
        padding: 0 20px;
        height: 64px;
        line-height: 64px;
        font-size: 16px;
        font-weight: bold;
        background-color: #fff;

        .left {
            span {
                margin-right: 4px;
            }

            .arrow {
                cursor: pointer;
            }
        }

        .right {
            text-align: right;
        }
    }

    .add-main {
        position: fixed;
        top: 64px;
        bottom: 88px;
        width: 100%;
        overflow-y: auto;
        background: #f4f6f8;
        padding: 20px 230px;
        display: flex;

        .step-container {
            height: 400px;
            width: 200px;
        }

        .form-container {
            flex: 1;
            background-color: #fff;
            overflow-y: auto;

            .title {
                height: 60px;
                line-height: 60px;
                padding-left: 20px;
            }

            .form {
                margin-bottom: 20px;
                padding: 20px 65px 24px;

                .el-form {
                    display: flex;
                    flex-wrap: wrap;
                }

                .info {
                    font-size: 14px;
                    color: #666;

                    .form-item {
                        margin-bottom: 20px;
                    }
                }
            }

            .form-box {
                width: 600px;
                display: flex;
                flex-direction: column;
            }
        }
    }

    .add-footer {
        position: fixed;
        bottom: 0;
        width: 100%;
        padding: 24px 50px;
        color: #000000d9;
        font-size: 14px;
        background: #fff;
        text-align: center;
        z-index: 10001;
    }

    .tree-wrapper {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;

        .tree-item {
            flex: 1;
            padding: 0px 4px;
            text-align: center;

            .tree-title {
                background: #f5f7fa;
                text-align: center;
                padding: 10px 0;
                margin-bottom: 12px;
            }
        }
    }
}
</style>